<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style>
#div1{
	background:#999;
	width:100px;
	height:200px;
	display:none;
	}
</style>
<script>
function showhide()
{
	var oDiv=document.getElementById('div1')
	if (oDiv.style.display=='block')
	  {
	   oDiv.style.display='none';
	  }
	   else
	   {
	   oDiv.style.display='block';
	   }
}

</script>
</head>

<body>
<input type="button" value="显示隐藏" onclick="showhide()"/>
<div id="div1"
</div>
</body>
</html>
